Noun

1. fluidity, fluidness, liquidity, liquidness, runniness, thinness

usage: the property of flowing easily; "adding lead makes the alloy easier to cast because the melting point is reduced and the fluidity is increased"; "they believe that fluidity increases as the water gets warmer"

2. fluidity, fluidness, changeableness, changeability

usage: a changeable quality; "a charming Oriental fluidity of manner"; "a certain fluidness in his perception of time made him an unpredictable colleague"; "demographers try to predict social fluidity"

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